package neo.app.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

import neo.core.common.Anonymous;

import com.opensymphony.xwork.ActionContext;


public class RandomPictureAction extends BaseAction implements Anonymous {   
    private static final long serialVersionUID = -6950908478971552308L;   
    private ByteArrayInputStream inputStream;   
  
    public String execute() throws Exception {   
    	log.debug(" ----------+++++");
    	
        // 在内存中创建图象   
        int width = 65, height = 20;   
  
        BufferedImage image = new BufferedImage(width, height,   
                BufferedImage.TYPE_INT_RGB);   
  
        // 获取图形上下文   
        Graphics g = image.getGraphics();   
  
        // 生成随机类   
        Random random = new Random();   
  
        // 设定背景色   
        g.setColor(getRandColor(200, 250));   
        g.fillRect(0, 0, width, height);   
  
        // 设定字体   
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));   
  
        // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到   
        g.setColor(getRandColor(160, 200));   
        for (int i = 0; i < 155; i++) {   
            int x = random.nextInt(width);   
            int y = random.nextInt(height);   
            int xl = random.nextInt(12);   
            int yl = random.nextInt(12);   
            g.drawLine(x, y, x + xl, y + yl);   
        }   
  
        // 取随机产生的认证码(6位数字)   
        String sRand = "";   
        for (int i = 0; i < 4; i++) {   
            String rand = String.valueOf(random.nextInt(10));   
            sRand += rand;   
            // 将认证码显示到图象中   
            g.setColor(new Color(20 + random.nextInt(110), 20 + random   
                    .nextInt(110), 20 + random.nextInt(110)));   
            // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成   
            g.drawString(rand, 13 * i + 6, 16);   
        }   
  
        // 将认证码存入SESSION   
        ActionContext.getContext().getSession().put("rand", sRand);   
  
        // 图象生效   
        g.dispose();   
        ByteArrayOutputStream output = new ByteArrayOutputStream();   
        ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);   
        ImageIO.write(image, "JPEG", imageOut);   
        imageOut.close();   
        ByteArrayInputStream input = new ByteArrayInputStream(output   
                .toByteArray());   
        this.setInputStream(input);   
        return SUCCESS;   
    }   
  
    /*  
     * 给定范围获得随机颜色  
     */  
    private Color getRandColor(int fc, int bc) {   
        Random random = new Random();   
        if (fc > 255)   
            fc = 255;   
        if (bc > 255)   
            bc = 255;   
        int r = fc + random.nextInt(bc - fc);   
        int g = fc + random.nextInt(bc - fc);   
        int b = fc + random.nextInt(bc - fc);   
        return new Color(r, g, b);   
    }   
  
    public void setInputStream(ByteArrayInputStream inputStream) {   
        this.inputStream = inputStream;   
    }   
  
    public ByteArrayInputStream getInputStream() {   
        return inputStream;   
    }   
  
}  
